release.yml

name: Promote Main to Release Branches

permissions:
  contents: write

on:
  workflow_dispatch:
    inputs:
      target:
        description: "Promote target (both keeps the legacy web+admin selection)"
        required: true
        default: "both"
        type: choice
        options:
          - all
          - both
          - web
          - admin
          - university
      force_redeploy:
        description: "When up to date, skip divergence and print manual redeploy guidance"
        required: true
        default: false
        type: boolean

jobs:
  generate_tag:
    name: Generate HeadVer Tag
    uses: ./.github/workflows/headver-tagging.yml
    with: {}

  create_release:
    name: Create GitHub Release
    runs-on: ubuntu-latest
    needs: generate_tag
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0

      - name: Create Release
        uses: ncipollo/release-action@v1
        with:
          tag: "v${{ needs.generate_tag.outputs.version }}"
          release_name: "Release v${{ needs.generate_tag.outputs.version }}"
          body: "Automated release created for build v${{ needs.generate_tag.outputs.version }}"
          token: ${{ secrets.GITHUB_TOKEN }}

  promote_release_branch:
    name: Promote main -> release branch(es)
    runs-on: ubuntu-latest
    needs: create_release
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Promote main branch to selected release branch(es)
        run: |
          set -euo pipefail

          git fetch origin main
          MAIN_SHA=$(git rev-parse origin/main)

          TARGET="${{ github.event.inputs.target }}"
          FORCE_REDEPLOY="${{ github.event.inputs.force_redeploy }}"

          case "$TARGET" in
            web)
              RELEASE_BRANCHES="release-web"
              ;;
            admin)
              RELEASE_BRANCHES="release-admin"
              ;;
            university)
              RELEASE_BRANCHES="release-university"
              ;;
            all)
              RELEASE_BRANCHES="release-web release-admin release-university"
              ;;
            both)
              RELEASE_BRANCHES="release-web release-admin"
              ;;
            *)
              echo "Unsupported target: $TARGET" >&2
              exit 1
              ;;
          esac

          {
            echo "## Release Promotion"
            echo "- Selected target: $TARGET"
            echo "- Promoted main SHA: $MAIN_SHA"
          } >> "$GITHUB_STEP_SUMMARY"

          for BRANCH in $RELEASE_BRANCHES; do
            git fetch origin "$BRANCH" || true

            if git show-ref --verify --quiet "refs/remotes/origin/$BRANCH"; then
              RELEASE_SHA=$(git rev-parse "origin/$BRANCH")
            else
              RELEASE_SHA=""
            fi

            if [ -z "$RELEASE_SHA" ]; then
              git push origin origin/main:"refs/heads/$BRANCH"
              {
                echo "- $BRANCH: created from main"
              } >> "$GITHUB_STEP_SUMMARY"
              continue
            fi

            if [ "$MAIN_SHA" = "$RELEASE_SHA" ]; then
              if [ "$FORCE_REDEPLOY" = "true" ]; then
                {
                  echo "- $BRANCH: already up to date"
                  echo "  - force_redeploy=true requested"
                  echo "  - skipped empty commit to keep release branch ancestry clean"
                  echo "  - trigger redeploy manually in Vercel if needed"
                } >> "$GITHUB_STEP_SUMMARY"
                continue
              fi

              {
                echo "- $BRANCH: already up to date"
              } >> "$GITHUB_STEP_SUMMARY"
              continue
            fi

            if ! git merge-base --is-ancestor "origin/$BRANCH" origin/main; then
              {
                echo "- $BRANCH: non-ancestor detected, forcing reset to main"
              } >> "$GITHUB_STEP_SUMMARY"
            fi

            git push --force-with-lease origin origin/main:"refs/heads/$BRANCH"
            {
              echo "- $BRANCH: updated"
            } >> "$GITHUB_STEP_SUMMARY"
          done

          {
            echo "- Note: Vercel production deploy is triggered by corresponding release branch update"
          } >> "$GITHUB_STEP_SUMMARY"